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48v FET-capsule circuit for longer cable runs?

 

Hi everyone. I need to build a mic with a PUI 5024 capsule that can be phantom powered AND be happy driving long cable runs. I think that rules out the Simple P48 circuit.

I am aware of Scott Helmke’s Alice circuit, which is a contender. Thoughts?

I’ve used the OPA Alice to great effect with non-FET capsules. Is there an obvious FET capsule version of this circuit?

Thanks in advance for your input!

Jonathan
 

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How long are the runs in question?

On 5/8/24 16:06, Jonathan Duckett wrote:

Hi everyone. I need to build a mic with a PUI 5024 capsule that can be phantom powered AND be happy driving long cable runs. I think that rules out the Simple P48 circuit.

I am aware of Scott Helmke’s Alice circuit, which is a contender. Thoughts?

I’ve used the OPA Alice to great effect with non-FET capsules. Is there an obvious FET capsule version of this circuit?

Thanks in advance for your input!

Jonathan

 

75-120ft (25-35 meters) concert hall and recording studio distances.
 

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The Simple P48 can run a decent distance. I k one of a 200ft run
Best Regards,

Jules Ryckebusch?

On May 8, 2024, at 18:14, Jonathan Duckett via groups.io <jonathan.duckett.audio@...> wrote:

?75-120ft (25-35 meters) concert hall and recording studio distances.

 

Probably any of the Alice variants are good for this application. Generally the 2.2k resistors connecting to the FET would be a bit higher value with built-in FETs.

-Scott

On 5/8/24 18:06, Jonathan Duckett wrote:
Hi everyone. I need to build a mic with a PUI 5024 capsule that can be phantom powered AND be happy driving long cable runs. I think that rules out the Simple P48 circuit.

I am aware of Scott Helmke’s Alice circuit, which is a contender. Thoughts?

I’ve used the OPA Alice to great effect with non-FET capsules. Is there an obvious FET capsule version of this circuit?

Thanks in advance for your input!

Jonathan
--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry
 

I have 2 semi-permanent balanced runs of about 50 ft, from the outside to my den, and I've currently got a pair of AOM-5024s with the simpleP48 powering on it... and they work very well.

So I would very much recommend trying a pair of simpleP48-powered capsules on 120 ft of mic cable just to see what you get.
 

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I have run my AmbiAlice on 100ft snakes on a stage with lighting etc with no issues - it is four channels of SimpleP48. ?BTW the SimpleP48 actually provides a balanced output. It is not 100% balanced but about 90% impedance balanced ?
Best Regards,

Jules Ryckebusch?

On May 9, 2024, at 09:58, kennjava via groups.io <ken@...> wrote:

?I have 2 semi-permanent balanced runs of about 50 ft, from the outside to my den, and I've currently got a pair of AOM-5024s with the simpleP48 powering on it... and they work very well.

So I would very much recommend trying a pair of simpleP48-powered capsules on 120 ft of mic cable just to see what you get.

 

Thanks everyone! I really appreciate your input on this (and elsewhere).
 

Thanks!

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